caddy/build.bash
Matthew Holt da08c94a8c Implant version information with -ldflags with help of build script
Without -ldflags, the verison information needs to be updated manually,
which is never done between releases, so development builds appear
indiscernable from stable builds using `caddy -version`.

This is part of a set of changes intended to relieve the burden of
always updating version information manually and distributing binaries
that look stable but actually may not be.

A stable build is defined as one which is produced at a git tag with
a clean working directory (no uncommitted changes). A dev build is
anything else. With this build script, `caddy -version` will now reveal
whether it is a development build and, if so, the base version, the
latest commit, the date and time of build, and the names of files with
changes as well as how many changes were made.

The output of `caddy -version` for stable builds remains the same.
2016-02-26 00:26:31 -07:00

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#!/usr/bin/env bash
#
# Caddy build script. Automates proper versioning.
#
# Usage:
#
# $ ./build.bash [output_filename]
#
# Outputs compiled program in current directory.
# Default file name is 'ecaddy'.
#
set -e
output="$1"
if [ -z "$output" ]; then
output="ecaddy"
fi
pkg=main
# Timestamp of build
builddate_id=$pkg.buildDate
builddate=`date -u`
# Current tag, if HEAD is on a tag
tag_id=$pkg.gitTag
set +e
tag=`git describe --exact-match HEAD 2> /dev/null`
set -e
# Nearest tag on branch
lasttag_id=$pkg.gitNearestTag
lasttag=`git describe --abbrev=0 --tags HEAD`
# Commit SHA
commit_id=$pkg.gitCommit
commit=`git rev-parse --short HEAD`
# Summary of uncommited changes
shortstat_id=$pkg.gitShortStat
shortstat=`git diff-index --shortstat HEAD`
# List of modified files
files_id=$pkg.gitFilesModified
files=`git diff-index --name-only HEAD`
go build -ldflags "
-X \"$builddate_id=$builddate\"
-X \"$tag_id=$tag\"
-X \"$lasttag_id=$lasttag\"
-X \"$commit_id=$commit\"
-X \"$shortstat_id=$shortstat\"
-X \"$files_id=$files\"
" -o "$output"